Aluminum corrosion

What are you guys using on parts in the engine bay that have corrosion on them? Ive noticed that the alternator, AC lines, intake manifold, fuel rail, etc all look like shit as it seems as they are corroding. I sanded down a flat surface which obviously removed the corrosion, but Id rather not do that do ever little part. See example below:
Also Ill snap some photos of the other parts later today as they are much worse than the letters above.

It can be, but if you use #0000 and VERY light pressure (almost none at all) it shouldn't hurt anything. Really the next best option is a solvent-type cleaner, but those can be nasty to work with especially in an engine bay where you've got more sensitive materials to work around.